I'll try and keep this as updated as possible as information becomes available.
In PDF style: here
To purchase the Sprint 4-in-1 BYOD Sim Card Kit: https://shop.sprint.com/mysprint/shop/accessory/ao_details.jsp?accSKU=121700244&accCatId=78300001&deviceIndependent=true
Contains: SIMOLW516TQ, SIMOLW506TQ, SIMOLW416Q, and SIMOLW506C
Maybe i'll find one time to do one for all of Sprints devices eventually...
Not sure if this is old news. Official T-Mobile Network shutdown dates:
T-Mobile 3G UMTS: July 1, 2022
T-Mobile 2G GSM: December 2022
Sprint 2G/3G CDMA: January 1, 2022
Sprint LTE/5G: June 30, 2022